Hi Chips and all, I'm the new members here. Would appreciate if you guys could help me on the above matter. What's the different between the Toyota D4 engine and the VVT-i engine. Any similarities between the 2 engine. I'm interested to get a Toyota Nadia with the D4 engine but heard that there is the problem for the D4 engine to take the unleaded gasoline from Shell as the Shell unleaded gasoline will caused the engine overheat problem. But the D4 engine work well with the unleaded gasoline for Petronas and Esso. Any comment on that???

The D4 (Direct Four) Toyota engine and its companion technology the VVTi (Variable Valve Timing intelligent) have been demonised and declared a no go area by some drivers and mechanics when it fails. Toyota Nadia 3s-fse Engine 5:35 AM Hi, I changed piston rings for 3s-fse engine but when removing cylinder head cam shaft position sensor deformed on top so when I finished assemblying started the engine it only runs for 10secs and stalls, so everytime I start the car just at 10secs it stalls.

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The Toyota Nadia is a good replacement for a Carib. The two engine types are quite different however. While both have similar internals, the big difference is the way the fuel is injected into the engine. With the VVTI engine, fuel is injected into the inlet manifold to mix with the air prior to entering the combustion chamber. In the D4 engine, fuel is injected under very high pressure into the combustion chamber itself (direct injection).

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During the combustion process, air is compressed and at a very precise moment fuel is injected directly into the combustion chamber. The idea behind this concept is to allow the engine to run leaner producing less emissions and lower fuel consumption.

In theory the D4 engine is very good and is an advancement on the VVTI however, history has shown it does not take much to upset the engine performance and issues such as surging, rough idle and engine stutter are not unusual. Unfortunately these problems are not that easily sorted out with little product knowledge on these engines available within the industry.

This often leads to expensive, unnecessary and time consuming repairs. VVTI stands for 'Variable Valve Timing Induction'. This engine type is a lot more conventional and improves performance by optimising valve timing.

It is a proven system, effective and very trouble free. The D4 can be recognised by a large plastic cover over the engine with embossed D4 lettering.

If I recall correctly, the VVTI engine has the lettering cast into the aluminium rocker cover on top of the engine. Technology is ever evolving and we're told the D4S system fitted to the Toyota 86 / Subaru BRZ (which is essentially a Subaru boxer engine) has been significantly refined since the early Toyota D4 system. We're told the D4S system in the 86/BRZ uses conventional port injection at start up and low rpm (where the richer running created much of the problem with the previous D4 system), then utilises direct injection at high rpm. Therefore, while it's early days for the new system, we can only assume that the engineers have refined the technology to overcome the problems that were associated with D4 (direct injection) systems of the past.

Definitely, high octane fuel with the D4 system is a must.